sad_8x8_sa2.sa

DM642的mpeg4编码

        .sect ".internal_code1"
        .global _ComputBlockSad
_ComputBlockSad .cproc A_srcImg, B_refImg, A_pitch
            .no_mdep

            .reg            B_srcImg, B_s3, B_s2, A_s1, A_s0, B_pitch
            .reg            B_s7654:B_s3210, A_s7654:A_s3210
            .reg            B_r7654:B_r3210, A_r7654:A_r3210
            .reg            B_d7654,B_d3210, A_d7654,A_d3210
            .reg            A_retval, B_sad, A_sad, i, B_k1, A_k1

            MVK     .1      0x0101,     A_k1
            PACK2   .1      A_k1,       A_k1,       A_k1
            MV      .2X     A_pitch,    B_pitch
            ADD     .2X     A_srcImg,   A_pitch,          B_srcImg
            
            MVK             3,          i
            ZERO            A_sad
            ZERO            B_sad
loop:       .trip           3,          3,          3
						
						
            LDNDW    .D1T2   * A_srcImg++(A_pitch),      B_s7654:B_s3210
            LDNDW    .D2T1   * B_srcImg++(B_pitch),      A_s7654:A_s3210
            LDNDW   .D1T2   * B_refImg++(B_pitch),  B_r7654:B_r3210
            LDNDW   .D2T1   * B_refImg++(B_pitch),  A_r7654:A_r3210
            
						ADD     .2      A_srcImg,    A_pitch,   A_srcImg
						ADD     .2      B_srcImg,	   B_pitch,  B_srcImg
						
            SUBABS4         B_s7654,    B_r7654,    B_d7654
            SUBABS4         B_s3210,    B_r3210,    B_d3210
            SUBABS4         A_s7654,    A_r7654,    A_d7654
            SUBABS4         A_s3210,    A_r3210,    A_d3210

            DOTPU4          B_d7654,    A_k1,       B_s3
            DOTPU4          B_d3210,    A_k1,       B_s2
            DOTPU4          A_d7654,    A_k1,       A_s1
            DOTPU4          A_d3210,    A_k1,       A_s0

            ADD             B_sad,      B_s3,       B_sad
            ADD             B_sad,      B_s2,       B_sad
            ADD             A_sad,      A_s1,       A_sad
            ADD             A_sad,      A_s0,       A_sad

   [i]      BDEC            loop,       i

            ADD             A_sad,      B_sad,      A_retval

            .return         A_retval
            .endproc